Subdeainage pipe



May 24, 1938.

'D. B. DIMICK SUBDRAINAGE PIPE Original Filed March 10, 1937 4 f. .llnfftflaflllrlldl i Reissued May 24, 1938 UNITED SfIi'IfEfS ENT' GFF IliCE SUBDRJAINAGE PIPEv Original No. 2,089,115, datediAugust 3; 1937, Se-

rial No.1 130,206, March 10,- 1937."

Application v forreissue March 7, 1938;' SerialfNo.' 194,512"V 10 Claims.

The present invention relates to drainage means, and more particularly to a drainage pipe and a novel construction of pipe section to make up the drainage pipe.

A-n object of this invention is to provide a drainage pipe section which will efficiently and quickly carry off drainage water in various installations, such as from a large area used as `an airport eld, a golf course, municipal play- 1UP" ground, baseball field, railroad freight yards and the like, as well as for use along railroad rlgh'ts-of-way and in the construction of class A paved' highways.

Another object of the present invention is to 1provide an improved construction of drainage pipe which may take the place of the now widely used steel perforated pipe which has openings in its lower side and depends upon a proper pressure head of the water before the latter enters the 20P'drainage pipe through the openings.

Another object of the present invention is to povide adrainage pipe section which is of substantially semi-cylindrical construction having its sectional edges directed upwardly and closed 251: across its top by aclosure ywall providing a trough orcon'cave cradle in the form of a web or wall which extends entirely across theV upper side of the pipe section and which is inclined from one end thereof near its upper edge gradually to the 30?l opposite end of thesection at a point spaced below the edge sufciently to provide water receiving openings between the abutting ends of the pipe sections.

Another object of ihepresent invention is to 36o provide a drainage pipe section of the bell and spigot type which has the top trough wall thereof terminating at the top edge of the pipe section in spaced relation to the enlarged or bell portion ofthe-section so that thev trough walls of adlirjacent sections are displaced vertically at their adjacentV ends'to admit water by gravity into the bases of the pipe sections for carrying off the water by gravity when the sections are assembled ina downwardly sloping line or grade.

The invention also provides acast iron structure which eliminates the corrosion and rusting ofthe' steel' pipes, a construction which rapidly and effectively carries oli the drainage water which'isvfed to the drainage device bygravity and linotl dependent upon hydrostatic pressure, and a devicev which cannot easily become clogged or choked incident to the accumulation of silt or thelike which is found to usually clog up and render ineffective drainage pipes and the like 56; heretofore used.

With the foregoing and other objects in view,- the invention will be more fully described here-- inafter, and will be more particularly pointed vout in the claims appended hereto.

In theidrawng,` wherein like symbols refer to like or correspondingI parts throughout' the sev eral views;

Figure l1 is a perspective view of a pairof drain# agepipe sectionsassembled for use.

Figure 2 is a vertical longitudinal section taken through the same on the line 2-2 of' FigureA l;

Figure 3is an enlarged transverse section takenr through one of the sections on the line-33l`of Figurey 1, and

Figure 4is a transverse section taken through'` a trench having the drainage pipeofthis-in vention disposed therein'.

Referring now to the drawing, thereis shown: in Figures land-.2 a drainage pipe made up of'a number of sections I0 constructed according: to'. the presentinvention. Each section I0 isoffcast iron, or other suitable material, and is substantiallysemi-circularin cross-Section so as tof-pro-` vide a hollow body ofsubstantial width anddepth to the pipe section. The semi-cylindrical section is adaptedy to bepositioned in aV trench withkits lower rounded bottom or surface towardthe'bot'- tom' of the trench, and with this'construction. the pipe section may' have considerable width-y ascompared withthe usual cylindrical vpipes znowf-T employed, and may thus cover a greaterxhorie zontal surface area for drainage to moreeectively catch the draink water and. carry it ofi"v by gravity through the pipe. The pipe, comprising. a plurality ofthe sections I0 may each haveL a` bell Il at one end andA a spigot'portionf I2 atfits.- opposite'endl so that the pipe sectionsintert as' shown in Figures 1 and12 to providea drainage:y pipe line' ofl desired length'.

Instead' ofV perforating the lower curved wall".

of the pipesection I0 .asiscommon in'drainagepipes, and which are found to beagreatsource-v of annoyance in clogging andthe like, the present" invention provides a: top Wall I31Which'extends between the upper edge port-ionsI of fthe pipe section I0 and is transversely curved'on a relatively:n large radius tto providea trough on vthe top of "thepipe section. This vwall I3extends from end'to end' of the pipe section III and `at the same time-isY sloped orinclined from end to end of the pipe sec tion4 As shown in Figures 1 and 2; the higher end'of the trough wall I3'initiates at the bell I I;

preferably at? a point spaced inwardly of the en'- larged end of thebell, or flush with thefinternall shoulder thereof. The wall |31 inclines` down'-M wardly from the bell I I at one end of the section to the spigot I2 at the other end of the section, the slope being a gradual slow one so as to impart gravitational movement to the drainage water settling upon the wall I3 to flow in the desired direction with respect to the pipe section.

When a plurality of the pipe sections I are assembled it will be observed, particularly from Figure 2, that the trough or upper surface of the wall I3 of the one section I0 isl inclined downwardly toward the adjacent sec-tion and terminates in slightly spaced relation below the upper end of the next adjacent Wall I3. v This provides a drainage inlet opening I4 through which water collected on the upper surfaces of the walls I3 may enter the interior or body portion of the drainage pipe. As shown in Figure 2, the drainage pipe is inclined in the direction of the slope of the wall I3 so that the water which is admitted to the interior of the built up drainage pipe through the openings I4, will flow by gravity continuously and evenly toward the lower end of the drainage pipe and thus maintain vthe interior thereof clear and unobstructed.

'I'he upper trough portion of the drainage pipe may be -made relatively wide so that the drainage water may be readily caught and trapped in the trough wall I3 and thence carried to the drainage pipe. In this way the water is collected by gravity and no upward press-ure of the water is required as is now generally necessary with present systems and drainage pipe structures, the ground will, therefore, be kept relatively dry as there will be no accumulation of entrapped water, and the ground areas thereby drained will be rapidly drained as the water is carried off quickly and eiliciently from. the very moment of accumulation.

It is only necessary to have the surface level of the accumulated water of a height suflicient to flow over the lateral edges of the pipe sections I0 so that the water may enter thetrough wall I3. Heretofore, it has been necessary for` a large body of water to accumulate with a relatively high surface level so as to obtain the necessary head or pressure of the water against the under side of the drainage pipe to force. the water through the perforation in the pipe, dislodge silt and other accumulations and thus effect at least a partial flow of the water through the drainage system. f

The provision and disposition of the concave upper wall I3 of the semi-cylindrical pipe section performs not only the function of reinforcing and strengthening the lateral walls of the body section I0, but also serves to accumulate a relatively large percentage of the drain water by gravity and direct the collected water to the opening I4 and thence into the interior or body of the pipe section in the direction of gravitational flow of the water in the pipe section. These features promote continued equal and efficient drainage of all Water which gravitates upon the upper' surface of wall I3 of the pipe section.

The drainagepipe may be laid in any suitable manner depending upon the conditions of installation, and in Figure 4 the drainage pipe is shown as installed below the ground surface I5 in a trench I6 of suitable width to accommodate the drainage pipe and which may have a bottom of the desired slope, and in which the drainage pipe is installed. Gravel II of other suitable material is lled into the trench I5 about and beneath the drainage pipe to the desired extent and the gravel body I1 may be of particles of various sizes to permit seepage of water downwardly in the trench I6 to the top of the drainage pipe. It will be noted that the drainage pipe is relatively wide as compared with the usual cylindrical or round pipe indicated by the broken line I8 in Figure 3 so that the drainage pipe of this invention is relatively wide or broad at. its top to insure the collection of a relatively large volume of the downwardly seeping drain water for carrying the same directly off.

It is obvious that various changes and modifications may be made in the details of construction and design of the above specifically described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claims:

What is claimed is:

l. A drainage pipe comprising a plurality of pipe sections disposed in endwise abutting relation, each pipe section having a semi-cylindrical body portion with a transversely concave closure wall extending between the upper edge portions of. the body portion, said closure wall being inclined from end to end of the pipe section with the lower end of one section adapted to terminate in'spaced relation below the upper end of an adjacent section whereby to provide an inlet opening or passage of drain water accumulating on the upper walls of the sections.

2. A drainage pipe section comprising a semicylindrical body portion having a rounded lower wall and provided with a trough wall extending between the upper edge portions of the body portion of they section, said trough wall being inclined from end to end of the pipe section for directing drain water collected in the trough wall toward one end of the section.

3. A drainage pipe section comprising a cast iron semi-cylindrical body portion having a spigot on one end and a bell on its opposite end, said cast iron body portion having an integral top wall extending throughout substantially theV length of the body portion and inclined from end to end of the body portion, said top wall being transversely concave to direct accumulated water on the top wall centrally of and toward one end of the section.

4. A drainage pipe comprising a plurality of bell and spigot sections disposed in endwise interiitting engagement, said sections being of substantially semi-cylindrical construction with their rounded surfaces lowermost and provided with` top walls extending throughout the length and width of the sections between the upper edge portions thereof, said top walls being transversely concave to provide troughs for the accumulation of drainage water gravitating on the tops of the pipe sections, said top walls of the pipe sections all inclined downwardly from end to end of the sections. and disposed with. the lower end of av top wall of one section spaced beneath the upper end of the top wall of an adjacent section to provide an opening through which the accumulated drain water on the top wall may pass to the interior of the drainage pipe.

5. A drainageV pipe section comprising a hollow body portion having a lower imperforated wall and provided with a wall crossing the top of the body portion and adapted to receive thereon water gravitating upon the drainage pipe section, said top wall of the pipe section being inclined from one end of the section toward the other to direct the drainage water over the top wall to one end of the section. A

Cil

6. A drainage pipe comprising a plurality of hollow body portions having top walls adapted to receive drainage water gravitating thereon, the top walls of the sections being inclined from end to end of the sections with the lower end of the top wall of one section spaced below the upper end of an adjacent section to provide openings at the meeting ends of the sections for passage of water deposited upon the top walls of the sections to the interior of the drainage pipe.

7. A drainage pipe comprising a plurality of, pipe sections, said pipe sections being substantially semi-cylindrical and having top walls displaced vertically at their adjacent ends to admit water by gravity into the pipe sections, said-pipe sections being assembled in a downwardly-sloping line to carry oii water by gravity.

8. A drainage pipe comprising a plurality of pipe sections disposed in endwise abutting relation, each pipe section having a semi-cylindrical body portion with a transversely-concave closure wall extending between the upper edge portions of the body portion, the closure wall of one section terminating in spaced relation below the upper end of the closure wall of an adjacent section whereby to provide an inlet opening or passage for drain water accumulating on the upper closure walls of the sections.

9. A drain pipe comprising a plurality of bell and spigot sections disposed in endwise intertting engagement, said sections being of substantially semi-cylindrical construction with their rounded surfaces lowermost and provided with top walls extending substantially throughout the length and width of the sections between the upper edge portions thereof, said top walls being transversely concave to provide troughs for the accumulation of. drainage water gravitating on the tops of the pipe sections, said top walls of the pipe sections being disposed with the end of a top Wall of one section spaced beneath the adjacent end of the top wall of an adjacent section to provide an opening through which the accumulated drain water on the top wall may passr to the interior of the drainage pipe.

10. A drainage pipe, composed of a plurality of pipe sections laid on an inclination for gravitational movement of the drain water, said sections being substantially semi-cylindrical and having tcp closure walls to receive the drain water, the top walls of adjacent sections being spaced apart at the near ends thereof to afford passage for the movement of the drain water from the top walls into the interior of the drain pipe.

DANIEL B. DINIICK. 

